无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2011, Vol. 43 ›› Issue (8): 51-.

• 论文 • 上一篇    下一篇

磷酸氢钙制备磷酸二氢钾的工艺研究Ⅱ——母液的净化、蒸发和结晶

李春丽1,关云山1,张志强1,邢英1,梁之帅1,张英智1,何全胜2   

  1. 1.青海大学化工学院,青海西宁 810016; 2.青海明胶股份有限公司
  • 出版日期:2011-08-10 发布日期:2011-08-10

Study on preparation of potassium dihydrogen phosphate with calcium hydrogen phosphate Ⅱ:purification,evaporation,and crystallization of mother liquid

Li Chunli1,Guan Yunshan1,Zhang Zhiqiang1,Xing Ying1,Liang Zhishuai1,Zhang Yingzhi1,He Quansheng2   

  1. 1.School of Chemical Engineering,Qinghai University,Xining 810016,China;
    2.Qinghai Gelatin Corporation Limited
  • Online:2011-08-10 Published:2011-08-10

摘要: 以明胶厂富产的磷酸氢钙为原料,与硫酸钾在液相中进行复分解反应,得到的母液经净化、蒸发和结晶制备得到磷酸二氢钾。考察了母液净化方式、母液pH、水蒸发量和自然冷却结晶等过程对产品纯度和质量的影响。结果表明:以氢氧化钠作除杂剂,控制母液pH=4.5,水蒸发量为70%(质量分数),自然冷却结晶得到的磷酸二氢钾产品可以达到国家工业一等品标准。

关键词: 磷酸二氢钾, 母液, 磷酸氢钙, 明胶

Abstract: After purification,evaporation,and crystallization,potassium dihydrogen phosphate was manufactured with mother liquid,which was prepared with calcium phosphate by-produced from gelatin plant and potassium sulfate by double decomposition reaction.Influences of the way of purification,pH of mother liquid,evaporation process,and natural cooling crystallization process on the purity and quality of product were also studied.Results showed that when sodium hydroxide was used as trash-removal agent,pH of mother liquid was 4.5,water evaporation was at 70% (mass fraction),and natural cooling crystallization was adopted,the quality of potassium dihydrogen phosphate reached the first grade requirement of the national industrial standard.

Key words: potassium dihydrogen phosphate, mother liquid, calcium hydrogen phosphate, gelatin

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